Backend systems,
built for the parts
that break.

Evidence infrastructure for software changes.

Problem

Release decisions get scattered across tickets, CI logs, and human approvals — impossible to audit later.

Built

A policy engine with deterministic allow/deny decisions, immutable snapshots, signed checkpoints, and offline-verifiable proof packs.

Depth

Versioned policy evaluation and separation-of-duties checks keep a decision reproducible long after deploy. 281 automated tests.

Python · FastAPI · PostgreSQL · Redis · SQLAlchemy

Decision-level observability for AI agents.

Problem

Raw traces show what an agent did, but not which decision caused the failure.

Built

Instrumentation and diagnosis for loops, state drift, context pollution, and tool-selection errors — plus the wasted-token cost of each.

Depth

Framework adapters hold one diagnosis model across OpenAI, Anthropic, LangGraph, CrewAI, AutoGen, and PydanticAI.

Python · TypeScript · FastAPI · AI Agents · Observability

A fault-tolerant transactional key-value store.

Problem

Sharding improves scale but makes consistency and atomic multi-shard writes much harder.

Built

A custom Raft-backed store with two-phase commit, snapshots, and chaos-tested linearizability checks.

Depth

Consensus protects each shard while 2PC coordinates transactions without hiding partial failure.

Go · Distributed Systems · Raft · 2PC · Snapshotting

A concurrency-safe double-entry financial ledger.

Problem

Retries and concurrent transfers can duplicate money movement or break accounting invariants.

Built

Atomic transfers, idempotent APIs, immutable audit logs, refunds, and replay-safe transaction handling.

Depth

PostgreSQL transactions and row-level locks preserve double-entry invariants under concurrent load.

Python · FastAPI · PostgreSQL · SQLAlchemy · Distributed Systems